Display screen with a transitional graphical user interface



FIG. 1 is a front view of a first image of a display screen with a transitional graphical user interface according to a first embodiment;

FIG. 2 is a front view of a second image thereof;

FIG. 3 is a front view of a first image of a display screen with a transitional graphical user interface according to a second embodiment; and,

FIG. 4 is a front view of a second image thereof.

The broken lines shown in the drawings of the display screen are shown for illustrative purposes only and form no part of the claimed design. The appearance of the image transitions sequentially between the images shown in FIGS. 1-2 and FIGS. 3-4. The process or period in which an image transitions to another forms no part of the claimed design. 

CLAIM The ornamental design for a display screen with a transitional graphical user interface, as shown and described. 